/**
 * #      814
 * 名称   二叉树剪枝
 * 链接   https://leetcode-cn.com/problems/binary-tree-pruning
 * 题解   [272](https://leetcode-cn.com/problems/binary-tree-pruning/solution)
 * 通过率 70.3%
 * 难道   中等
 */

